Section Env-Wq 1008.04 - Minimum Distances(a) The minimum separation distance in feet between components of an ISDS and the identified receptors shall be as specified in Table 1008-2, subject to (b) through (j), below: Table 1008-2: Minimum Separation Distances (in Feet)
Component[RIGHTWARDS ARROW] Receptor[DOWNWARDS ARROW] | Septic Tank | Bed | Sewer Line |
Surface Water | 75 | 75 |
Poorly Drained Jurisdictional Wetland | 50 | 50 |
Very Poorly Drained Jurisdictional Wetland | 75 | 75 |
Open Drainage | 75 | 75 |
Culvert, Tight Pipe | 10 | 25 |
Catch Basin | 35 | 35 |
Reservoir | 75 | 75 |
Water Lines, pressure | 10 | 25 | 10 |
Water lines, suction | 50 | 50 | 50 |
Property lines | 5 | 10 | 5 |
Foundation, any type, with Foundation Drains | 5 | 15 |
Foundation, full cellar, without Foundation Drains | 5 | 10 |
Foundation, slab, without Foundation Drains | 5 | 5 |
Foundation Drains Outfall Pipe (Solid) | 5 | 5 |
Foundation Drain Outfall (Discharge) | 25 | 25 |
Top of Natural Embankment or Natural Steep Slope | 5 | 20 |
Stormwater Pond intercepting SHWT | 50 | 75 |
Stormwater Pond not intercepting SHWT | 25 | 35 |
Geothermal well, open loop | 75 | 75 |
Geothermal well, closed loop | 25 | 25 |
Upgradient swale to divert surface water from EDA not intercepting SHWT, below finished grade of EDA | 10 | 25 |
Upgradient swale to divert surface water from EDA not intercepting SHWT, above finished grade of EDA | 10 | 10 |
Upgradient interceptor drain intercepting SHWT to divert groundwater from EDA | 25 |
Outfall of upgradient interceptor drain intercepting SHWT to divert groundwater from EDA | 75 |
(b) In-ground swimming pools shall not be located within 35 feet down-slope of a bed or within 10 feet in any direction of a bed.(c) The distance between a septic tank and surface water, open drainage, very poorly drained soil, an open loop geothermal well, or a private on-site well may be reduced to 50 feet if: (1) Pipe having an SDR of 26 or equivalent is used; and(2) The tank is either made from plastic or coated with a sealant to prevent infiltration and exfiltration.(d) The distance between a septic tank and open drainage or between a bed and open drainage may be reduced to 25 feet or 35 feet, respectively, where the open drainage and associated culverts, such as a roadside ditch, does not intercept the seasonal high groundwater.(e) The distance between a water line and a bed may be reduced to 10 feet, and the distance from a water line to a septic tank may be reduced to 5 feet, if the waterline is sleeved in continuous length SDR 35 pipe or equivalent, to the distance specified in Table 1008-2.(f) For any well for which a wellhead protection area has been established pursuant to RSA 485-C, the distance between the well and the septic system components shall be as established in Env-Ws 378 or successor rules in subtitle Env-Dw.(g) For purposes of approving a replacement ISDS serving a residence on a lot created after September 1, 1989, where the ISDS components cannot be installed in accordance with Table 1008-2, above, due to the residence being constructed in other than the location shown when the original approval was issued, the separation distances shall be as close to the specified distance as possible.(h) A septic tank, pump chamber, or bed may be closer than 25 feet to the foundation drain where: (1) The bottom of the cellar is at least 18 inches above the seasonal high water table; or(2) The basement slab is at a higher elevation than the finished grade of the bed.(i) Set-backs to known burial sites, burial grounds, and cemeteries shall comply with RSA 289:3, III, which prohibits new construction, excavation, and building within 25 feet of a known burial site or within 25 feet of the boundaries of an established burial ground or cemetery, subject to local regulations.(j) Set-backs to water supply wells shall be determined as specified in: (1) The approval issued under Env-Dw 300 for public water supply wells; or(2) Table 1008-4 in Env-Wq 1008.06 for private water supply wells, whether commercial or non-commercial.N.H. Admin. Code § Env-Wq 1008.04
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08; amd by #9904-A, eff 4-16-11
Amended by Volume XXXVI Number 41, Filed October 13, 2016, Proposed by #11184, Effective 10/1/2016, Expires 10/1/2026.